Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bc6e37223dc115…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 18:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e89e2fa87c5171fbfd4e86a8735139d0 SHA-1: 18bdf1d9f33f083c4e190764d2db0e3477abb734 SHA-256: 24bc6e37223dc115dabdb96da090d965b5a37e6f61de5819ee910174bc418e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links strongly suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=scrapbooking+for+dummies+pdf PDF link annotation
    • http://bomtvcloud.com/data/board/file/20210514003559.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/a57241b4e4555940993da1c2429c4ae8/genosifafofakod.pdfIn PDF document text
    • http://goref.ru/files/file/dofuna.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/89568121276.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc9ad0142---3969837158.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/jevake.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kikejanewarimowepapix.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dabc3a47c7d---forezujupeporizag.pdfIn PDF document text
    • https://synersys.fr/contenu/file/xavofisuwonekegekiwo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f147c90a03---2243397086.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/buvivusonitedamo.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/pojalijabinesiwuworujoput.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/luwinegofosabogezuwataw.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/bifute.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ec7341a2c7b05a81e8964496c9e48702/87139085311.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/84217928385.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/pukubixiza.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/41417909177.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978b872e73d---95709465726.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/lukezimuwurexod.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/96059370724.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc9c0397a---40984145570.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903b8679e6e---moxasawiwojanarasenera.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/56789725176.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 16516 bytes
SHA-256: 81b1975711b7d38d73d06e9e2d34333ec63948a32a0aebff66185438e0d6fa61
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 11224 bytes
SHA-256: 3870363ed66ef8267548ec92604f6b000baf492a5bfa4bdd7854ffc587df7f35
font_02_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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